664840074855 has 64 divisors (see below), whose sum is σ = 1186110604800. Its totient is φ = 315273745920.

The previous prime is 664840074823. The next prime is 664840074863. The reversal of 664840074855 is 558470048466.

It is not a de Polignac number, because 664840074855 - 2⁵ = 664840074823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664840074795 and 664840074804.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1744461 + ... + 2091129.

It is an arithmetic number, because the mean of its divisors is an integer number (18532978200).

Almost surely, 2^664840074855 is an apocalyptic number.

664840074855 is a deficient number, since it is larger than the sum of its proper divisors (521270529945).

664840074855 is a wasteful number, since it uses less digits than its factorization.

664840074855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346944.

The product of its (nonzero) digits is 25804800, while the sum is 57.

The spelling of 664840074855 in words is "six hundred sixty-four billion, eight hundred forty million, seventy-four thousand, eight hundred fifty-five".